建筑渣土对泡沫混凝土孔结构与传热的影响  

Effects of Construction Residue Soil on Pore Structure and Heat Transfer of Foamed Concrete

作　　者：杨晨熙 金超 蒋俊 吴艳萍 刘铁 黄金桥 YANG Chenxi;JIN Chao;JIANG Jun;WU Yanping;LIU Tie;HUANG Jinqiao(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Ningbo Construction Engineering Group Co.,Ltd.,Ningbo 315040,Zhejiang,China)

机构地区：[1]西南科技大学环境友好能源材料国家重点实验室,四川绵阳621010 [2]西南科技大学材料与化学学院,四川绵阳621010 [3]宁波建工工程集团有限公司,浙江宁波315040

出　　处：《西南科技大学学报》2024年第2期32-39,共8页Journal of Southwest University of Science and Technology

基　　金：四川省自然科学基金项目(2022NSFSC1135);宁波市科技计划项目(科技创新2025创新挑战赛2022T003)。

摘　　要：为促进建筑渣土在建筑保温领域的资源化利用,以建筑渣土料浆为成孔介质,取代预制泡沫,辅以物理发泡工艺,制备了400 kg/m^(3)和600 kg/m^(3)密度等级泡沫混凝土,研究了渣土对其孔结构及传热行为的影响。结果表明:密度400 kg/m^(3)泡沫混凝土的渣土料浆体积取代率从0%增至60%,导热系数从0.09 W/(m·K)降至0.07 W/(m·K);密度600 kg/m^(3)泡沫混凝土的渣土料浆体积取代率从0%增至100%,导热系数从0.14 W/(m·K)降至0.10 W/(m·K);渣土料浆的掺入细化了泡沫混凝土孔结构,增加了微观孔隙率。由于孔结构细化带来传热路径延长、气相导热系数与多孔基体导热系数下降,泡沫混凝土保温隔热性能提升。To promote the resource utilization of construction residue soil in the field of building insulation,foamed concrete with density grades of 400 kg/m^(3) and 600 kg/m^(3) was prepared by using construction residue soil paste as the pore-forming medium to replace prefabricated foam and applying physical foaming process.The influence of construction residue soil on the pore structure and heat transfer behavior of foamed concrete was investigated.The results show that for foamed concrete with a density of 400 kg/m^(3),the volume replacement rate of construction residue soil paste ranges from 0%to 60%and the thermal conductivity decreases from 0.09 W/(m·K)to 0.07 W/(m·K).For foamed concrete with a 600 kg/m^(3) density,the volume replacement rate of construction residue soil paste ranges from 0%to 100%and the thermal conductivity decreases from 0.14 W/(m·K)to 0.10 W/(m·K).The addition of construction residue soil paste refines the pore structure of foamed concrete and increases the microscopic porosity.The refinement of the pore structure is attributed to the elongation of heat transfer paths and the decrease of thermal conductivity of the gas-phase and porous matrix,which improves the thermal insulation performance of foamed concrete.

关 键 词：建筑渣土 泡沫混凝土 孔结构 保温隔热性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]